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【单选题】
楼板纵向钢筋的连接一般都选用( )
A.
机械连接
B.
绑扎搭接
C.
焊接
D.
浆锚连接
拍照语音搜题,微信中搜索"皮皮学"使用
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举一反三
【单选题】The main difficulty with teaching is the large _____ of work.
A.
number
B.
content
C.
part
D.
volume
【单选题】What is the main difficulty in recycling?
A.
Searching for the related information.
B.
Changing people's habits on rubbish disposing
C.
The fact that too much rubbish is produced.
【判断题】通过技术诊断,可以及时了解和发现教学过程中的问题。
A.
正确
B.
错误
【简答题】根据中文意思,写出英文单词或词组 感应电动机
【单选题】关于外码概念正确描述是
A.
外码与码一样不能出现重复值
B.
外面的取值是某个关系的主码值但可以重复
C.
外码不可以是属性组
D.
外码的取值不能是本关系的主码值
【判断题】通过技术诊断,可以及时了解和发现教学过程中的问题。
A.
正确
B.
错误
【简答题】You must cultivate good manners and behave like a gentleman. ( 培养 )
【简答题】请按照task2的要求,将答案按照视频要求正确朗读,提交语音。如: The main difficulty I have in time management is how to 2.根据自己的情况完成task1的测试并提交算出来的总分。如:task1 我的得分是xxx
【单选题】关于码的正确描述是
A.
主码都是由属性组构成的
B.
主码与候选码共同点是无重复值的属性
C.
候选码都是由单一属性构成的
D.
一个关系只能有一个候选码
【单选题】The main difficulty the writer had in reading in her 7th grade was that ______.
A.
she often forgot her school reading assignments
B.
she had difficulty reading with comprehension
C.
she had a poor vocabulary and very bad grammar
D.
she always looked elsewhere when asked to read
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